BulkUpsertRequest

{
    "sources": [
        {
            "source": "player",
            "source_id": "01HX3QJBR4E8YZ0KFGN5MP6T2W",
            "entries": [
                {
                    "key": "player_level",
                    "type": "string",
                    "value": 42,
                    "tags": [
                        "combat",
                        "stats"
                    ],
                    "access": [
                        "game_api.read"
                    ]
                }
            ]
        }
    ]
}